Geological Evolution and Analysis of Confirmed or Suspected Gas Hydrate Localities. Volume 1. Blake-Bahama Outer Ridge - US East Coast

摘要

This document is Volume 1 of a series of reports entitled ''Geological Evolution and Analysis of Confirmed or Suspected Gas Hydrate Localities.'' Volume 1 is an analysis of the ''Blake-Bahama Outer Ridge - US East Coast.'' This report presents a geological description of the Blake-Bahama Outer Ridge, including regional and local structural settings, geomorphology, geological history, stratigraphy, and physical properties. It provides the necessary regional and geological background for more in-depth research of the area. Detailed discussion of bottom simulating acoustic reflectors, sediment acoustic properties, distribution of hydrates within the sediments, and the relation of hydrate distribution to other features such as salt diapirism are also included. The formation and stabilization of gas hydrates in sediments are considered in terms of phase relations, nucleation, and crystallization constraints, gas solubility, pore fluid chemistry, inorganic diagenesis, and sediment organic content. Together with a depositional analysis of the area, this report is a better understanding of the thermal evolution of the locality. It should lead to an assessment of the potential for thermogenic hydrocarbon generation. 111 refs., 26 figs., 6 tabs. (ERA citation 11:008312)